All NFs: Handling of duplicated attach with same IMSI
How to reproduce
- Start CN (e.g. basic-nrf)
- Start gnbsim with IMSI *31
- Start gnbsim2 with IMSI *31 (change in docker-compose)
Issue
- both gnbsim's have a distinct PDU session and are able to have a user traffic
Expected Behavior
- AMF should reject the second NGAP Registration request or de-register the first session (we need to discuss about this and check in the standards)
- Also, other NFs should validate that, e.g. SMF or UPF should reject the message from AMF
Trace
issue_double_imsi_usage.pcapng